Make gmic-py + text example

[myselfhimself]

G'MIC seems a bit weak at using fonts for displaying text.

A tutorial could demonstrate making mixed text+image creation using dynamic text rendering from a foreign Python library:

• either Skia-python (especially using its numpy array output)
• or Pillow (espscially with WIP GmicImage.from_PIL/to_PIL methods). G'MIC filtering and montage commands could be used before/after foreign text rendering and ingesting.

This seems so simple that it could be the next available pixls.us gmic-py tutorial.